Re: [PATCH 0/4] allow multiple kthreadd's

Tejun Heo
2020-05-05T15:54:09Z

Hello, Bruce.

On Mon, May 04, 2020 at 10:15:14PM -0400, J. Bruce Fields wrote:
> We're currently using it to pass the struct svc_rqst that a new nfsd
> thread needs. But once the new thread has gotten that, I guess it could
> set kthread->data to some global value that it uses to say "I'm a knfsd
> thread"?
>
> I suppose that would work.
>
> Though now I'm feeling greedy: it would be nice to have both some kind
> of global flag, *and* keep kthread->data pointing to svc_rqst (as that
> would give me a simpler and quicker way to figure out which client is
> conflicting). Could I take a flag bit in kthread->flags, maybe?

Hmm... that'd be solvable if kthread->data can point to a struct which does
both things, right? Because it doesn't have free() callback, it's a bit
awkward but the threadfn itself can unlink and RCU-free it before returning.

Thanks.

--
tejun